b² + 2bc + c² - 2(b×c)
b² + 2bc + c² - 2 ( bc)
b² + 2bc + c² - 2bc
b² + 2bc - 2bc+ c²
b² + 0 + c²
b² + c²
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b² + 2bc + c² - 2(b×c)
b² + 2bc + c² - 2 ( bc)
b² + 2bc + c² - 2bc
b² + 2bc - 2bc+ c²
b² + 0 + c²
b² + c²